[wtfishackernews]

I got similar improvements when porting hashicorp/golang-lru[1]

  name         old time/op    new time/op    delta
  2Q_Rand-16     1.22µs ±10%    0.52µs ± 8%   -57.69%  (p=0.000 n=20+19)
  2Q_Freq-16     1.03µs ±10%    0.44µs ±12%   -57.42%  (p=0.000 n=18+20)
  ARC_Rand-16    1.51µs ± 9%    0.70µs ±15%   -53.63%  (p=0.000 n=20+20)
  ARC_Freq-16    1.22µs ±12%    0.54µs ± 7%   -56.20%  (p=0.000 n=20+20)
  LRU_Rand-16     401ns ± 9%     215ns ± 6%   -46.46%  (p=0.000 n=20+20)
  LRU_Freq-16     376ns ±13%     194ns ± 7%   -48.51%  (p=0.000 n=19+20)

[1]: https://github.com/hashicorp/golang-lru/pull/111